A lamp of 100W at 200V is supplied current at 100 volts. It will be equivalent to the lamp of:

A lamp of 100W at 200V is supplied current at 100 volts. It will be equivalent to the lamp of: 

 a. 50W b. 40W c. 25W d. 10W 
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A lamp of 100W at 200V is supplied current at 100 volts. It will be equivalent to the lamp of: 25W

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